[tex]Dane:\\m = 1 \ kg\\h = 70 \ cm = 0,7 \ m\\g = 10\frac{N}{kg}\\Szukane:\\E_{k} = ?\\\\Rozwiazanie\\\\Z \ zasady \ zachowania \ energii\\\\E_{p} = E_{k}\\\\E_{p} = mgh = E_{k}\\\\E_{k} = mgh\\\\E_{k} = 1 \ kg\cdot10\frac{N}{kg}\cdot0,7 \ m\\\\\boxed{E_{k} = 7 \ J}[/tex]
